And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
Genesis 17:10-12
10
This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
11
And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
12
And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.
Exodus 12:48
And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.
Leviticus 12:3
And in the eighth day the flesh of his foreskin shall be circumcised.
Deuteronomy 12:32
What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.
Luke 1:6
And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless.
Luke 1:59
And it came to pass, that on the eighth day they came to circumcise the child; and they called him Zacharias, after the name of his father.
Luke 2:21
And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb.
John 7:22
Moses therefore gave unto you circumcision; (not because it is of Moses, but of the fathers;) and ye on the sabbath day circumcise a man.
John 7:23
If a man on the sabbath day receive circumcision, that the law of Moses should not be broken; are ye angry at me, because I have made a man every whit whole on the sabbath day?
Acts 7:8
And he gave him the covenant of circumcision: and so Abraham begat Isaac, and circumcised him the eighth day; and Isaac begat Jacob; and Jacob begat the twelve patriarchs.